CN101548311B - Display drive apparatus, display apparatus and drive control method thereof - Google Patents

Display drive apparatus, display apparatus and drive control method thereof Download PDF

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Publication number
CN101548311B
CN101548311B CN200880000765.8A CN200880000765A CN101548311B CN 101548311 B CN101548311 B CN 101548311B CN 200880000765 A CN200880000765 A CN 200880000765A CN 101548311 B CN101548311 B CN 101548311B
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current
display pixel
data line
data
voltage
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CN101548311A (en
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尾崎刚
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Soras Oled
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Casio Computer Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0238—Improving the black level
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

Abstract

The invention discloses a display drive apparatus for driving a display pixel, including a light-emitting element and a light-emission drive element, connected to a data line, further including a reset circuit and a gradation current supply circuit. The reset circuit initializes the display pixel by applying a reset voltage to the display pixel wherein the reset voltage has a voltage value being such that an absolute value of a potential difference applied between a control terminal of the light-emission drive element and one end thereof is a larger value than an absolute value of a threshold voltage of the light-emission drive element, and has a polarity capable of discharging charge remaining in wiring capacitance of the data line and a capacitance component of the display pixel. The gradation current supply circuit supplies a gradation current having a signal polarity and magnitude corresponding to a gradation value of display data to the display pixel initialized.

Description

Display drive apparatus, display device and driving control method thereof
Technical field
The present invention relates to display drive apparatus, there is the display device of this display drive apparatus and their driving control method.More specifically, the present invention relates to drive the display drive apparatus of display pixel, described display pixel respectively has the light-emitting component of Current Control type, for luminous with required brightness degree by supplying with scheduled current, and drives control method.The invention still further relates to the display device that adopts described display drive apparatus to drive the display panel of multiple display pixels with array, and drive control method.
Background technology
The display (display device) of known luminescence component type, described light-emitting component such as organic electroluminescent device (being called " organic EL " below) or light emitting diode (LED), this display device comprises display panel, described display panel has the display pixel of two-dimensional array on its substrate, each display pixel has the light-emitting component of Current Control type, for luminous with the brightness degree of being scheduled to according to the drive current that offers this light-emitting component.
For this display of light-emitting component type, its luminous driving control structure and control method of the various light-emitting component control for above-mentioned Current Control type is proposed at present.For every in the display pixel of formation display panel, a kind of driving control structure of known embodiment comprises driving circuit (pixel-driving circuit), and it has multiple light-emitting components and for controlling the luminous transistor unit of light-emitting component (on-off element).
The driving control method with the display panel of the array of display pixels that comprises driving circuit comprises electric current designation method, to offer the driving circuit of each display pixel according to the grading current that shows data appointment in the method, thereby make light-emitting component luminous with the brightness degree of being scheduled to.
But, state in the use in the display device of driving control method of electric current specified type, in each display pixel, provide and write the corresponding operating that the operation requirements that shows data (grading current) holds the parasitic wired electric on data line or be arranged on maintenance electric capacity in display pixel etc. and charge to predetermined voltage.Therefore,, in the write operation in the inferior grade region of particularly reducing at grading current, be easy to occur the Write fault that demonstration data cannot fully write within the predetermined write time.And the operating characteristic that is arranged on the on-off circuit in the driving circuit of each display pixel is deteriorated.Particularly, along be connected serially to light-emitting component for the increase of threshold voltage variation of thin film transistor (TFT) of light emission drive current is provided, the light emission drive current that offers light-emitting component from driving circuit reduces, and causes deterioration in image quality.
Summary of the invention
The object of the present invention is to provide the display drive apparatus of the driving control method that uses electric current specified type, with the display device that uses this display drive apparatus, even wherein the operating characteristic of the luminous driving element in the pixel-driving circuit of each display pixel deteriorated, light-emitting component can also be with corresponding to showing that the suitable grade of data is luminous, thereby can suppress the deteriorated of image quality.
To achieve these goals, proposed according to display drive apparatus of the present invention, for driving the display pixel that is connected to data line, described display pixel comprises the pixel-driving circuit of light-emitting component and the described light-emitting component of driving,
Described pixel-driving circuit comprises luminous driving element, and described luminous driving element has current path and control terminal, and one end of this current path is connected to one end of described light-emitting component, and the other end of this current path is connected to the power lead that supply voltage is provided,
Described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path
This display drive apparatus comprises:
Reset circuit, it is by being set as described display pixel described selection mode and resetting voltage is applied to described display pixel by described data line, carry out display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described data line and the capacitance component of described display pixel can be discharged; And
Grading current provides circuit, the drift current of its generated data electric current and regulation, and the grading current that deducts described data current from described drift current and generate is offered by described data line and is set as described selection mode and carried out described initialized described display pixel, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein said grading current provides circuit to comprise:
Data current source, it generates described data current; With
Drift current source, it generates described drift current,
In the time that being greater than the current value of described drift current, the current value of described data current is set to first mode, in this first mode, use described data current source, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set to the second pattern, in this second pattern, use described drift current source, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
To achieve these goals, according to the present invention, propose a kind of display device of displays image information, comprising:
Display panel, there is the array of multiple display pixels, described display pixel is arranged near of the each point of crossing in the multiple point of crossing between multi-strip scanning line and many data lines, wherein each display pixel comprises light-emitting component and pixel-driving circuit, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path,
Reset circuit, it is applied to described each display pixel by resetting voltage by described every data line by described display pixel is set as to described selection mode and carrys out each display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and there is the polarity that the electric charge being retained in the distribution electric capacity of described every data line and the capacitance component of described each display pixel can be discharged, and
Grading current provides circuit, the drift current of its generated data electric current and regulation, and the grading current that deducts described data current from described drift current and generate is offered by described data line and is set as described selection mode and carried out described initialized described display pixel, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein said grading current provides circuit to comprise:
Data current source, it generates described data current; With
Drift current source, it generates described drift current,
In the time that being greater than the current value of described drift current, the current value of described data current is set to first mode, in this first mode, use described data current source, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set to the second pattern, in this second pattern, use described drift current source, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
To achieve these goals, according to the driving control method that the present invention proposes a kind of display drive apparatus, described display drive apparatus is for driving the display pixel that is connected to data line, described display pixel comprises light-emitting component and drives the pixel-driving circuit of described light-emitting component, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path, said method comprising the steps of:
Described display pixel is set as to selection mode;
Resetting voltage is applied to the described display pixel that is set to described selection mode by described data line, thereby display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described data line and the capacitance component of described display pixel can be discharged; And
After having carried out described initialization, the drift current of generated data electric current and regulation, and deduct described data current and generate grading current from described drift current, by described data line, described grading current is offered to the described display pixel that is set as described selection mode, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein, described grading current is offered in the step of described display pixel,
In the time that being greater than the current value of described drift current, the current value of described data current is set as first mode, in this first mode, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set as the second pattern, in this second pattern, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
To achieve these goals, according to the driving control method that the present invention proposes a kind of display device, described display device is for displays image information on display panel, described display panel has the array of multiple display pixels, described multiple display pixel is arranged near of the each point of crossing in the multiple point of crossing between multi-strip scanning line and many data lines, wherein each display pixel comprises light-emitting component and pixel-driving circuit, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path, said method comprising the steps of:
Described each display pixel is set as to selection mode;
By being applied to the described each display pixel that is set to described selection mode by described every data line, resetting voltage carrys out each display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described every data line and the capacitance component of described each display pixel can be discharged; And
After having carried out described initialization, the drift current of generated data electric current and regulation, and deduct described data current and generate grading current from described drift current, by described data line, described grading current is offered to the described display pixel that is set as described selection mode, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein described grading current is offered in the step of described each display pixel,
In the time that being greater than the current value of described drift current, the current value of described data current is set as first mode, in this first mode, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described each display pixel by described every data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set as the second pattern, in this second pattern, make to deduct described data current and the described grading current that generates flows to the direction that enters described each display pixel by described every data linear flow from described drift current.
Brief description of the drawings
Fig. 1 is the schematic block diagram illustrating according to the general structure of display device of the present invention;
Fig. 2 is the view illustrating according to the general structure of the critical piece of the display device of the embodiment of the present invention;
Fig. 3 A and 3B illustrate the schematic block diagram being applicable to according to the example of the data driver of the display device of embodiment;
Fig. 4 A and 4B illustrate the view being applicable to according to the general structure of the example of the Voltage-current conversion/current source circuit of the data driver of embodiment;
Fig. 5 illustrates the view being applicable to according to the circuit structure of the instantiation of the display pixel of the display device of embodiment (pixel-driving circuit, light-emitting component);
Fig. 6 is the sequential chart illustrating according to the basic operation of the display pixel of the use pixel-driving circuit of embodiment;
Fig. 7 A and 7B are the schematic diagram illustrating according to the operation of the pixel-driving circuit of embodiment;
Fig. 8 is the sequential chart illustrating according to the example of the driving control method of the display device of embodiment;
Fig. 9 is the performance diagram illustrating according to relation between the grading current of the display device of the comparative example of the operating effect of this embodiment of explanation (absorbing (sink) electric current) and light emission drive current;
Figure 10 is the performance diagram illustrating according to relation between the grading current of the display device of embodiment (Absorption Current, source electric current) and light emission drive current;
Figure 11 is illustrated in the writing than the performance diagram of relation between (reset current ratio) of the grading current that is applied to the magnitude of voltage of data line and display pixel in voltage reset operation and offers display pixel;
Figure 12 is that the switch that is illustrated in the signal polarity of electric current write operation middle grade electric current is set the performance diagram that exists or do not have and offer relation between the degradation (ratio of the light emission drive current between original state and deterioration state) of the light emission drive current of organic EL; And
Figure 13 A and 13B are the sequential charts illustrating according to the change in voltage of write operation in the display device of embodiment.
Embodiment
Below, the embodiment shown in reference to the accompanying drawings describes the driving control method of display drive apparatus of the present invention, this device in detail, and has the display device of this display drive apparatus.
< display device >
First, will the general structure according to display device of the present invention be described.
Fig. 1 is the schematic block diagram illustrating according to the general structure of display device of the present invention.
Fig. 2 is the view illustrating according to the general structure of the critical piece of the display device of the embodiment of the present invention.
As shown in figs. 1 and 2, generally include according to the display device 100 of this embodiment:
Display panel 110, it (for example has two-dimensional array, the matrix array of the capable m row of n, wherein n and m are positive integers) multiple display pixel EM, for example, near the each display pixel each point of crossing between multiple sweep trace SL and multiple data line DL of orthogonal setting is made up of light-emitting component and the pixel-driving circuit (corresponding to above-mentioned driving circuit of the prior art) of the Current Control type of describing below;
Scanner driver (scan drive circuit, select circuit) 120, is connected to the sweep trace SL of display panel 110, for the sequential by be scheduled to, sweep signal Vsel is applied to every sweep trace SL, is set as preference pattern for being often about to display pixel EM;
Data driver (signal drive circuit) 130, be connected to the data line DL of display panel 110, be used for obtaining after display circuit for generating 160(and will be described) the demonstration data that provide, and provide the grading current Ipix corresponding with specific demonstration data to data line DL with the sequential of being scheduled to;
Reset circuit 140, is connected to data line DL, for before providing grading current Ipix from data driver 130, with the sequential of being scheduled to, resetting voltage Vrst is applied to each display pixel EM by every data line;
System controller (control circuit) 150, for generation of with output scanning control signal and data controlling signal, described scan control signal and data controlling signal are for based on being described after display circuit for generating 160() clock signal providing carrys out each operator scheme of gated sweep driver 120 and data driver 130; And
Display circuit for generating 160, show data (brightness degree value) for the video signal generating based on for example providing from the source of display device 100 outsides, and these data are offered to data driver 130, extract simultaneously or produce for based on described demonstration data by predetermined image information display the clock signal on display panel 110 (system clock etc.), and this signal is offered to system controller 150.
Below the each parts to above-described structure are elaborated.
(display panel)
Display panel 110 shown in Fig. 2 is controlled to carry out selectively: reset operation, wherein, after self-scanning in future driver 120(, will be elaborated) sweep signal Vsel be applied to the sequential of every sweep trace, in the future the predetermined resetting voltage Vrst of self-resetting circuit 140 is applied to every data line DL, and (remaining) electric charge keeping in the maintenance electric capacity of the parasitic distribution electric capacity on every data line and each display pixel (this capacitor illustrates in the back) is discharged for initialization; Electric current write operation, wherein, remains on the maintenance electric capacity of (writing) each display pixel corresponding to the component of voltage that offers the grading current Ipix of every data line DL from data driver 130; And light emission operation, wherein, the light emission drive current based on component of voltage is offered to light-emitting component, thus luminous with the brightness degree of being scheduled to.
According to this embodiment, display pixel EM(will be described with reference to Fig. 5 below) each controlled for example, (to select level, high level) sweep signal Vsel enter preference pattern (selecting the period) or at non-selection level (for example while being applied to described display pixel, low level) the non-selection mode (non-selection period) of sweep signal Vsel while being applied to described display pixel, in preference pattern, grading current Ipix is provided and shows that data are written into (as electric current write operation), stop light emission drive current offering light-emitting component to enter not luminance simultaneously, , in non-selection mode, the light emission drive current of the grading current Ipix based on being write by electric current write operation is provided for light-emitting component to enter luminance, thereby luminous with the brightness degree of being scheduled to.In addition, below, will describe in detail and the display pixel EM(pixel-driving circuit that together uses according to the display panel of this embodiment) specific circuit example and circuit operation.
(scanner driver)
Gated sweep driver 120 in the following manner, the i.e. scan control signal based on providing from system controller 150, (for example will select level, high level) sweep signal Vsel be sequentially applied to sweep trace SL, thereby display pixel EM on every row is set as to preference pattern, and within this period (selecting the period), the grading current Ipix being provided by every data line DL based on demonstration data by data driver 130 is written in each display pixel EM.
Scanner driver 120, for example formed by shift-register circuit 121 and output circuit unit 122 as shown in Figure 2, wherein this shift-register circuit 121 is for based on describing in detail in the back from system controller 150(as scan control signal) the scanning commencing signal SST and the scan clock signal SCK that provide sequentially export the shift signal corresponding to the sweep trace SL every row, and this output circuit unit 122 is for converting the described shift signal of exporting from shift-register circuit 121 to prearranged signal level (high level) and the output control signal SOE based on providing from system controller 150 as scan control signal exports sweep signal Vsel to every sweep trace SL.
(data driver 130)
Fig. 3 A and 3B illustrate the schematic block diagram being applicable to according to the example of the structure of the data driver of the display device of this embodiment.
Fig. 4 A and 4B illustrate the view being applicable to according to the general structure of the example of the Voltage-current conversion/current source circuit of the data driver of this embodiment.
Data driver 130 operates in the following manner:, data controlling signal based on providing from system controller 150 with the temporal order be scheduled to obtain and keep comprising from display circuit for generating 160(and will describe in detail in the back) every row of the digital signal that provides shows data, and within the selection period of setting for every sweep trace SL, produces together and offer every data line DL corresponding to the grading current Ipix of the brightness degree of particular display data.
Data driver 130, for example, as shown in Fig. 3 A, comprising: shift-register circuit 131, sequentially export shift signal for the data controlling signal based on providing from system controller 150 (shift clock signal CLK, sampling commencing signal STR); Data register circuit 132, the demonstration data D0 to Dm of the every row providing from display circuit for generating 160 is sequentially provided for the input timing based on shift signal; Data-latching circuit 133, for keeping the demonstration data D0 to Dm of the every row being obtained by data register circuit 132 based on data controlling signal (data latch signal STB); Digital to analog converter 134, is converted to predetermined analog signal voltage (voltage gradation Vpix) for the grade reference voltage V 0 to Vp based on providing from power circuit (not shown) by kept demonstration data D0 to Dm; And Voltage-current conversion/current source circuit 135, for generation of the grading current Ipix corresponding with the demonstration data that are converted to analog signal voltage, and this grade electric current I pix is exported to each display pixel EM with the sequential of the data controlling signal based on providing from system controller 150 (output enable signal OE) together by every data line DL.
Especially, according to Voltage-current conversion/current source circuit 135 of this embodiment, for example as shown in Figure 4 A, comprise: data current source IAs, its one end is connected to lead-out terminal OUT(output contact Nout), its second end is connected to low-voltage source Vss, and this data current source IAs is used for providing and is converted to by digital to analog converter 134 data current that the demonstration data of analog signal voltage (voltage gradation Vpix) correspond to; And skew (offset) current source IBs, its one end is connected to high voltage source Vdd, and its second end is connected to lead-out terminal OUT(output contact Nout), this drift current source IBs is for providing predetermined drift current.
Data current source IAs is configured to from lead-out terminal OUT(output contact Nout) provide data current to low-voltage source Vss, drift current source IBs is configured to the output contact Nout from high voltage source Vdd to lead-out terminal OUT(simultaneously) identical electric current is provided.
Drift current source IBs, for example as shown in Figure 4 B, can be P-channel field-effect transistor (PEFT) transistor (FET), one end of its current path (source electrode-drain circuit) be connected to high voltage source Vdd, and the other end of its current path is connected to lead-out terminal OUT(output contact Nout).Lead-out terminal OUT(output contact Nout) for example, by on-off circuit (transistor switch, not shown) be connected to data line DL, this on-off circuit is arranged to be suitable for data controlling signal (the output enable signal OE) ON/OFF based on providing from system controller 150.
In the case of existing the Voltage-current conversion/current source circuit 135 that can use for every data line DL, from the data current being produced according to the voltage gradation Vpix setting corresponding to the brightness degree that shows data by data current source IAs, deduct the predetermined drift current being produced by drift current source IBs, drift current is increased and exceeded according to the data current of the brightness degree (voltage gradation) of demonstration data, thereby produce positive grading current Ipix, this positive grading current in inferior grade region from lead-out terminal OUT flow to by force (by forces flow to) data line DL(as by the back detailed description current source system).
On the other hand, in and in high-grade region, data current increase has exceeded drift current, thereby produce negative grading current Ipix, this negative grading current is drawn (draw) (attracting (attract)) and is flowed to lead-out terminal OUT(as by the current absorption system describing in detail in the back from data line DL).
Particularly, the grading current Ipix that offers data line DL is switched, and is negative or for just according to being included in brightness degree value in the demonstration data that write in display pixel EM.
(reset circuit 140)
Reset circuit 140 executivecontrol function in the following manner:, resetting voltage Vrst is applied to the display pixel EM being set under preference pattern by every data line DL with scheduled timing, this scheduled timing from data driver 130 based on reseting controling signal RST by based on showing that sequential (electric current write operation) that the grading current Ipix of data offers every data line DL before, the stored charge that makes to be retained in the electric charge in the parasitic distribution electric capacity on data line DL and be included in the maintenance electric capacity (this capacitor will be explained below) in each display pixel EM is discharged, so that being set to (initialization), this device becomes original state.
The adoptable structure of reset circuit 140 comprises multiple on-off elements, for every the data line DL being arranged on display panel 110, one end of each on-off element is connected to the voltage source of resetting voltage Vrst, and be suitable for based on reseting controling signal RST together ON/OFF, thereby resetting voltage Vrst is applied to every data line DL.Particularly, as shown in Figure 2, reset circuit 140 is suitable for being made up of multiple transistor switch SWrst, wherein one end of the current path of each transistor switch (source electrode-drain circuit) is applied in shared resetting voltage Vrst, the other end of current path is connected to every data line DL, and control terminal (grid) provides shared reseting controling signal RST.
In the reset operation of being carried out by reseting controling signal RST, (will in Fig. 8, describe in detail), during the write operation period of every row display pixel EM, provide corresponding to show data grading current Ipix sequential (electric current write operation) before, apply resetting voltage Vrst by every data line DL, thereby the electric charge that is retained in the electric charge in the distribution electric capacity of data line DL and is set in accumulation in the maintenance electric capacity (capacitor) of the display pixel EM in the row under preference pattern is discharged.Therefore, resetting voltage Vrst is applied to each display pixel EM by every data line DL and there is the sequential relevant with the sequential that applies sweep signal Vsel with the reseting controling signal RST of the electric discharge of control stored charge.Therefore, reseting controling signal RST can be produced and export based on scan control signal by scanner driver 120, or produces and directly export to reset circuit 140 by system controller 150.
In addition, resetting voltage Vrst is relatively low, can be satisfactorily discharges being retained in the electric charge of accumulating in the maintenance electric capacity of electric charge in the distribution electric capacity of every data line DL and each display pixel EM.According to this embodiment, at resetting voltage Vrst for example, lower than (being arranged on light-emitting component in each display pixel EM, organic EL) the situation of cathode voltage under,, equal ground voltage (zero) at the voltage at negative electrode place, resetting voltage Vrst is set to and absolute value lower than ground voltage and is greater than zero negative voltage (for example, absolute value is 5-5V), will describe in detail in the back.
This embodiment is described reset circuit 140 and data driver 130 configuration independently mutually in this situation with reference to the situation shown in Fig. 2.But, as shown in Figure 3 B, have with Fig. 2 in the reset circuit 136 of circuit structure of equivalence can be arranged in for example output stage of the data driver 130 shown in Fig. 3 A (Voltage-current conversion/current source circuit 135 final stage), and these building blocks can be configured to individual data driver 130(in this case, the reset circuit 140 shown in Fig. 2 is removed) and be built in single driver chip.As another alternative, reset circuit 140 can with the panel base plate of display panel 110 on display pixel EM and each wiring entirety form.
(system controller 150)
System controller 150 executivecontrol function in the following manner:, scan control signal for controlling this operation and data controlling signal are exported to above-described scanner driver 120 and data driver 130, thereby activate each driver with the sequential of being scheduled to, produce thus sweep signal Vsel and grading current Ipix and export display panel 110 to, and the demonstration data that produced by display circuit for generating 160 are produced and write in each display pixel EM to carry out light emission operation, thereby show predetermined image information.
(display circuit for generating 160)
Display circuit for generating 160 extracts brightness degree component of signal from the vision signal that for example source of display device 100 outsides provides, and these demonstration data (brightness degree value) are offered to data driver 130 every a line for display panel 110.The clock signal component that comprises the display timing generator of having specified image information in vision signal, for example TV broadcast singal (composite video signal), display circuit for generating 160 can possess the function of extracting brightness degree component of signal and extraction clock signal component and providing it to system controller 150.In this case, by system controller 150, the clock signal based on providing from display circuit for generating 160 produces the scan control signal and the data controlling signal that offer scanner driver 120 and data driver 130.
The instantiation > of < display pixel
Next, be arranged on the instantiation of the circuit of the each display pixel on display panel with reference to relevant drawings explanation.
Fig. 5 illustrates the view being applicable to according to the circuit structure of the instantiation of the display pixel of the display device of this embodiment (pixel-driving circuit, light-emitting component).
As shown in Figure 5, generally comprise pixel-driving circuit DC according to the display pixel EM of this embodiment, for the sweep signal Vsel based on applying from above-mentioned scanner driver 120, display pixel EM is set as to preference pattern, with component of voltage form, under preference pattern, obtain and the grading current Ipix providing from data driver 130 is provided, and will offer light-emitting component corresponding to the light emission drive current of grading current Ipix; And the light-emitting component of Current Control type, for example organic EL OLED, luminous with the brightness degree of being scheduled to for the light emission drive current based on providing from pixel-driving circuit DC.
For example pixel-driving circuit DC as shown in Figure 5, there is especially the structure that comprises following parts: transistor Tr 11, its gate terminal is connected to sweep trace SL, and drain terminal is connected to power voltage line VL(supply voltage Vsc), source terminal is connected to contact N11; Transistor Tr 12, its gate terminal is connected to sweep trace SL, and source terminal is connected to data line DL, and drain terminal is connected to contact N12; Transistor (luminous driving element) Tr13, its gate terminal is connected to contact N11, and drain terminal is connected to power voltage line VL, and source terminal is connected to contact N12; And capacitor (maintenance electric capacity) Cs, be connected to (between the grid and source electrode of transistor Tr 13) between contact N11 and contact 12.
According to the transistor Tr 11 to Tr13 using in the pixel-driving circuit DC of this embodiment, there is no particular restriction.By pixel-driving circuit DC is all formed with for example N slot field-effect transistor (thin film transistor (TFT)), can adopt N raceway groove amorphous silicon film transistor.In this case, can and there is the pixel-driving circuit DC of stable operation characteristics (electron mobility etc.) with relatively simple technique manufacture by the amorphous silicon manufacturing technology with ripe.In addition, capacitor Cs can be the stray capacitance being formed between grid and the source electrode of transistor Tr 13, or also can between transistor Tr 13 grids and source electrode, connect a capacitor except this stray capacitance.
The anodic bonding of organic EL OLED is to the contact N12 of pixel-driving circuit DC, and its negative electrode is for example connected to reference voltage V cath(in predetermined low potential, ground voltage Vgnd).
In addition, as will be described in detail as basic operation below, in preference pattern or non-selection mode (strictly speaking according to display pixel EM, in electric current write operation or light emission operation), be applied to the electromotive force of supply voltage Vsc of power voltage line VL below or above reference voltage V cath.
Fig. 6 illustrates to use according to the sequential chart of the basic operation of each display pixel of the pixel-driving circuit of this embodiment.
Fig. 7 A and 7B are the schematic diagram illustrating according to the operation of the pixel-driving circuit of this embodiment.
With reference to Fig. 6, the i display pixel EM capable and j row to the display pixel EM that is positioned at two-dimensional array on display panel 110 (matrix arrays of the capable m row of n) is described.
In above-mentioned pixel-driving circuit DC, the luminous employing of light-emitting component (organic EL OLED) for example as shown in Figure 6 a vertical scanning period Tsc drive as one-period and control, make a specific vertical scanning period Tsc comprise on the one hand electric current write operation period Tprg, comprise on the other hand light emission operation period (non-selection period) Tem, wherein, in electric current write operation period Tprg, the display pixel EM that is connected to sweep trace SL is selected and is written into and keeps as component of voltage corresponding to the grading current Ipix that shows data; In light emission operation period (non-selection period) Tem, offer organic EL OLED and the brightness degree execution light emission operation (Tsc >=Tprg+Tem) of the component of voltage based on being written into and keep to be scheduled to corresponding to the light emission drive current that shows data in electric current write operation period Tprg.Electric current write operation period Tprg sets for each sweep trace SL being connected with the display pixel EM on every row, and it is not overlapped each other in time.
According to this embodiment (will be elaborated in Fig. 8 below), carries out and predetermined resetting voltage Vrst is applied to the voltage reset operation (voltage reset operation period Trst) of display pixel EM by every data line DL, and the write operation period Twrt(that the display pixel EM on every row is set to preference pattern subsequently selects the period) in execution write the electric current write operation (electric current write operation period Tprg) of grading current Ipix.Therefore (will describe in detail in the back) carried out in, electric current write operation (current programmed operation) within than the shorter time of write operation period Twrt.
(electric current write operation period)
In the electric current write operation period Tprg of display pixel EM, as shown in Figure 6, first high level sweep signal Vsel is applied to the sweep trace SL of appointment, subsequently the display pixel EM on particular row is set as to preference pattern, low level power voltage (≤reference voltage V cath) is applied to the power voltage line VL of the display pixel EM of same a line simultaneously.In addition, with this sequential synchronised, be applied to every data line DL corresponding to the grading current Ipix of the demonstration data of this row from data driver 130.
According to this embodiment (will be elaborated), according to the brightness degree value being included in the demonstration data that write each display pixel, the grading current Ipix that offers every data line DL is made as to negative or positive below.Grading current Ipix is negative if, drawn (attraction) to flow to data driver 130 from display pixel EM via data line DL, if and grading current Ipix, for just, is forced (it is flowed to forcibly) flowing towards the direction of display pixel EM via data line DL from data driver 130 on the other hand.
Following declarative description is as the situation of the basic operation of display pixel EM, and grading current Ipix is also drawn to flow to data driver 130 from display pixel EM via data line DL for negative.
In the situation that applying high level sweep signal Vsel, the transistor Tr 11 of pixel-driving circuit DC and Tr12 conducting, and low level power voltage Vsc is applied to contact N11(, one end of the gate terminal of transistor Tr 13 and capacitor Cs).Meanwhile, grading current Ipix is drawn to flow to data line DL, and therefore, electromotive force is applied to contact N12(than the lower voltage of low level power voltage Vsc, the source terminal of the other end of capacitor Cs and transistor Tr 13).
As mentioned above, along with the generation (between transistor Tr 13 grids and source electrode) of electric potential difference between contact N11 and N12, transistor Tr 13 conductings, and flow to according to driving circuit 130 by transistor Tr 13, contact N12, transistor Tr 12 and data line DL from power voltage line VL corresponding to the write current Ia of grading current Ipix as shown in Figure 7A.
In this process, flow with by write current Ia and the corresponding electric charge of electric potential difference that produces at (between grid and source electrode in transistor Tr 13) between contact N11 and N12 accumulates as component of voltage and keeps (being filled with) in capacitor Cs.In addition, its voltage level is not higher than low level reference voltage V cath(ground voltage Vgnd) supply voltage Vsc be applied to power voltage line VL.And, consider that write current Ia is controlled and flow to the fact of data line DL from contact N12, it is lower that the electromotive force that is applied to the anode (contact N12) of organic EL OLED becomes electromotive force (reference voltage V cath) than negative electrode, thereby do not have electric current to flow in organic EL OLED, and do not carry out light emission operation.
(light emission operation period)
Next, during light emission operation period Tem after electric current write operation period Tprg, as shown in Figure 6, low level sweep signal Vsel is applied to the sweep trace SL of appointment from scanner driver 120, and be set as non-selection mode with the display pixel EM in a line, simultaneously by high level supply voltage Vsc(> reference voltage V cath) be applied to the power voltage line VL of the display pixel EM in same a line.In addition, with this sequential synchronised, the operation that stops data driver 130 and draw grading current Ipix.
Result, the transistor Tr 11 of pixel-driving circuit DC and Tr12 cut-off, and supply voltage Vsc to contact N11(, one end of the gate terminal of transistor Tr 13 and capacitor Cs) apply and be cut off, cut off simultaneously owing to data driver 130 draw grading current Ipix to contact N12(, the other end of the source terminal of transistor Tr 13 and capacitor Cs) the applying of voltage level.Therefore, capacitor Cs remains on the electric charge of accumulating during electric current write operation period Tprg as above.
Consider that capacitor Cs remains on the voltage being filled with during electric current write operation as above, kept electric potential difference at (between grid and source electrode in transistor Tr 13) between contact N11 and N12, and transistor Tr 13 keeps conducting.In addition, consider that the supply voltage Vsc that voltage level is higher than reference voltage V cath is applied to power voltage line VL, the electromotive force that is applied to the anode (contact N12) of organic EL OLED becomes higher than the electromotive force at its negative electrode place (reference voltage V cath).
Therefore, as shown in Fig. 7 B, predetermined light emission drive current Ib is along flowing into organic EL OLED via the forward bias direction of transistor Tr 13 and contact N12 from power voltage line VL, thereby organic EL OLED is luminous.The electric potential difference producing under the situation of the electric potential difference (charging voltage) of the electric charge based on accumulating in capacitor Cs corresponding to the write current Ia inflow transistor Tr13 corresponding with grading current Ipix.Therefore the light emission drive current Ib that, offers organic EL OLED is substantially equal to write current Ia.So, during light emission operation period Tem after electric current write operation period Tprg, based on electric current write operation period Tprg during the corresponding component of voltage of the demonstration data (grading current Ipix) that write, provide continuously light emission drive current Ib by transistor Tr 13.Therefore, organic EL OLED continues with luminous corresponding to the brightness degree that shows data.
Above-mentioned sequence of operations sequentially repeats for all sweep trace SL that form display panel 110, has consequently write the demonstration data for a screen of display panel, and luminous with the brightness degree of being scheduled to, thereby demonstrates required image information.
By way of parenthesis, except the structure of the display device 100 shown in Fig. 1, predetermined supply voltage Vsc is applied to according to the structure of the power voltage line VL in the pixel-driving circuit DC of this embodiment and also comprises the structure with analog line driver, this analog line driver is connected to multiple power voltage line VL that be arranged in parallel with sweep trace SL display panel 110, the wherein power control signal based on providing from system controller 150, the sequential (Fig. 6) of the supply voltage Vsc with scheduled voltage to synchronize with the sweep signal Vsel exporting from scanner driver 120, be applied to power voltage line VL for the row (being arranged on the display pixel EM under preference pattern) that the sweep signal Vsel being provided by scanner driver 120 is provided from this analog line driver.
Have three transistor Tr 11 to Tr13 using the circuit structure as pixel-driving circuit DC although above-mentioned display pixel EM is depicted as, the present invention is not limited to this structure of this embodiment; And alternatively, have more than three transistorized circuit structures and can realize identical effect.In addition, substitute and have the structure of organic EL as light-emitting component, the present invention is not limited to this structure, and can alternatively comprise the light-emitting component of other Current Control types, for example light emitting diode.
The driving control method > of < display device
Next, will explain according to the driving control method of the display device of this embodiment.
Fig. 8 is the sequential chart illustrating according to the example of the driving control method of the display device of this embodiment.
The driving control method with the display device 100 of said structure supposes that a vertical scanning period Tsc is as one-period, for example as shown in Figure 8, it is set as comprising: voltage reset operation period Trst, wherein, the display pixel EM of every row is configured to preference pattern, and the electric charge that is retained in the electric charge in the parasitic distribution electric capacity on data line DL and be accumulated in capacitor (maintenance electric capacity) Cs in display pixel EM is discharged to enter original state (voltage reset operation period Trst); Write operation period (selecting the period) Twrt, be used for carrying out electric current write operation (current programmed operation, electric current write operation period Tprg), to have corresponding to showing the signal polarity of data and the grading current Ipix of amplitude by providing after reset operation, predetermined component of voltage is filled with in the capacitor Cs of each display pixel EM; And light emission operation period (non-selection period) Tem, wherein, after write operation period Twrt, by the display pixel EM of every row being set as to non-selection mode the component of voltage generation light emission drive current Ib based on being filled with in capacitor Cs, make organic EL OLED with the brightness degree luminous (Tsc >=Twrt+Tem=Trst+Tprg+Tem) corresponding to showing data.
These a series of driving operations sequentially repeat for every row, meanwhile, form Twrt(voltage write operation period, Trst reset operation period and the electric current write operation period Tprg of the selection period of every row) be configured to the electric current write operation period of other row not overlapping in time.
Particularly, according in the driving control method of this embodiment, electric current write operation (electric current write operation period Tprg) in the basic operation (Fig. 6) of display pixel EM is carried out in above-mentioned write operation period Twrt, and voltage reset operation (voltage reset operation period Trst) in write operation period Twrt to carry out in the sequential of electric current write operation in advance.
To describe each operation below in detail.
(voltage reset operation)
First, during voltage reset operation period Trst, as shown in Figure 8, low level power voltage Vsc(≤reference voltage V cath) be applied to power voltage line VL, and high level sweep signal Vsel is sequentially applied to every sweep trace SL from scanner driver 120, thereby the display pixel EM of every row is set to preference pattern, afterwards or afterwards outright, high level reseting controling signal RST offers reset circuit 140 from for example system controller 150, thereby carries out voltage reset operation.
As a result, be included in and form pixel-driving circuit DC(Fig. 5 of each display pixel EM) in transistor Tr 11 and Tr12 conducting, each transistor switch SWrst of the reset circuit of conducting simultaneously 140.Therefore, electromotive force is for example zero lower than the reference voltage V cath(in negative electrode one side of organic EL OLED) resetting voltage Vrst(for example,-5V) be applied to the second end (contact N12) of the capacitor Cs of pixel-driving circuit DC via data line DL from reset circuit (transistor switch SWrst), thus be retained in the electric charge in the distribution electric capacity of every data line DL and the electric charge that is accumulated in the capacitor Cs of each display pixel EM is discharged to enter original state.In this process, transistor Tr 11 conductings, and therefore, gate terminal (control terminal) and the drain terminal short circuit of transistor (luminous driving element) Tr13, make the drain electrode-source voltage of transistor Tr 13 equal its grid-source voltage.So via data line DL, resetting voltage Vrst is applied between the drain electrode and source electrode of transistor Tr 13 on the one hand, is applied to again between the grid and source electrode of transistor Tr 13 simultaneously.
(electric current write operation)
Next, during electric current write operation period Tprg after voltage reset operation period Trst, as shown in Figure 8 and above described in the basic operation (Fig. 6 and 7) of pixel-driving circuit DC, keep being applied to every sweep trace SL from scanner driver 120 at high level sweep signal Vsel, the display pixel EM of every row remains on preference pattern simultaneously, and low level power voltage Vsc is applied to power voltage line VL.Simultaneously, have corresponding to showing that the signal polarity of data and the grading current Ipix of amplitude offer each display pixel EM from data driver 130 via every data line DL, thus by based on grading current Ipix(≈ write current Is) component of voltage keep (being filled with) in the capacitor Cs of pixel-driving circuit DC.
According to this embodiment, as mentioned above, according to the brightness degree value that shows data, the grading current Ipix that offers each display pixel EM via every data line DL from data driver 130 is become to plus or minus.As below by detailed description, in the inferior grade region that shows data (brightness degree value), grading current Ipix becomes positive from data driver 130, make grading current Ipix must flow into the display pixel EM(that is set to preference pattern hereinafter referred to as " current source system " via data line DL from data driver 130 as " being toppled over (pour) ", the grading current Ipix being associated is " source electric current ").On the other hand, in the high-grade region of neutralization that shows data (brightness degree value), grading current Ipix becomes negative from data driver 130, make grading current Ipix from the display pixel EM that is set to preference pattern via data line DL, as being drawn, offer data driver 130(hereinafter referred to as " current absorption system ", the grading current Ipix being associated is " Absorption Current ").
(light emission operation)
After electric current write operation period Tprg during the light emission operation period Tem of (after write operation period Twrt), as shown in Figure 8 and above in the basic operation of pixel-driving circuit DC (Fig. 6 and 7) described, low level sweep signal Vsel is applied to every sweep trace SL from scanner driver 120, wherein Tprg finishes the electric current write operation period, thereby display pixel EM is set to non-selection mode.Meanwhile, high level supply voltage Vsc is applied to power voltage line VL, make to offer organic EL OLED based on the light emission drive current Ib that remains on the component of voltage in capacitor Cs, thereby to carry out light emission operation corresponding to the brightness degree that shows data.
The checking > of < operating effect
Below at length verify the operating effect of above-mentioned display drive apparatus, display device and driving control method thereof.
Before explaining the operating effect of this embodiment, checking is according to the operating characteristic of the comparative example of the display device of this embodiment (hereinafter referred to as " comparison other ").
Fig. 9 is the performance diagram of relation between grading current (Absorption Current) that the display device of the comparison other of the operating effect for explaining the present embodiment is shown and light emission drive current.
Figure 10 is the performance diagram illustrating according to relation between the grading current of the display device of the present embodiment (Absorption Current, source electric current) and light emission drive current.
In Fig. 9 and 10, showing supposition voltage reset operation period Trst is 10 μ sec, and electric current write operation period Tprg is 55 μ sec and adopts negative voltage (5V) and 0V as the simulation test result under the condition of resetting voltage Vrst.
In the following description, the electromotive force of supposing power voltage line VL is 0 during voltage reset operation.
As mentioned above, control in the following manner according to the display device of this embodiment:, be retained in the electric charge in the distribution electric capacity of every data line DL and remain on each display pixel EM(pixel-driving circuit DC) capacitor Cs in electric charge discharge by predetermined resetting voltage Vrst is applied to specific data line DL, thereby carry out reset operation (initialization operation), and then be write operation, in this write operation, have corresponding to showing that the signal polarity of data and the grading current Ipix of amplitude offer every data line DL, thereby will remain in the capacitor Cs of each display pixel EM corresponding to the component of voltage of grading current Ipix.
In the comparative example (comparison other) of this embodiment, suppose according to the write operation of the display device of this embodiment and work in the following manner:, by only using current absorption system to remain on corresponding to the component of voltage of grading current Ipix in (being written to) each display pixel EM, wherein in this current absorption system, only negative current is provided for each display pixel EM by data line DL, using the grading current Ipix as corresponding to showing data (brightness degree value), and corresponding to the write current Ia(Absorption Current of specific grading current Ipix) be drawn into data driver 130 from display pixel EM via data line DL.
With reference to only using current absorption system to write the situation that shows data, the grading current providing from data driver 130 (being drawn into especially, the Absorption Current of data driver 130) Ipix and the relation that flows to from the pixel-driving circuit DC of each display pixel EM between the light emission drive current Ib of organic EL OLED are verified.As shown in Figure 9, in the high-grade region of the neutralization with relatively large grading current Ipix, light emission drive current (for the luminous electric current of the pixel) Ib that offers organic EL OLED from pixel-driving circuit DC trends towards increasing according to grading current (Absorption Current) the Ipix substantial linear ground that offers data line DL from data driver 130.
Relation between In Grade electric current I pix and light emission drive current Ib is at length verified.Suppose as normally used in voltage reset operation, resetting voltage Vrst is made as to zero (identical with the electromotive force of power voltage line VL).Be made as under the situation of zero (Vrst=0, Absorption Current [Vth=1V]) at grading current Ipix as shown in choice refreshments line in Fig. 9, light emission drive current Ib can be made as zero.But, take very little value (especially at grading current Ipix, be approximately zero) inferior grade region in, light emission drive current Ib be approximately zero and light emission drive current Ib no longer linear with respect to grading current Ipix, thereby cause during the electric current write operation period Tprg(=55 μ that is set as simulation test condition s) problem that cannot fully keep corresponding to the component of voltage of grading current Ipix.This is because the grading current Ipix providing via data line DL from data driver 130 is for charging to capacitor Cs, until the charging voltage of capacitor Cs reaches the threshold voltage vt h of transistor Tr 13, and after this, a part of grading current Ipix is used for capacitor Cs to charge, and makes electric current mobile in the current path of transistor Tr 13 become less than grading current Ipix.
In addition, in the pixel-driving circuit DC of each display pixel EM, comprise, (for example change under the situation of (Vth drift) light emission drive current Ib is offered to the threshold voltage vt h of the transistor Tr 13 of organic EL OLED for luminous driving, become the situation of 3V from 1V at threshold voltage vt h), as choice refreshments line (Vrst=0 in Fig. 9, Absorption Current [Vth=1V]) and thick dotted line (Vrst=0, Absorption Current [Vth=3V]) shown in, there is marked change in the light emission drive current Ib in inferior grade region, cannot be with the luminous problem of brightness degree corresponding to showing data thereby the brightness variation that causes organic EL OLED is increased to.
In the situation that resetting voltage Vrst is made as absolute value and is greater than zero, or be preferably set to a certain value, in the situation that getting this value, drain electrode-the source voltage of power voltage line VL and contact N12(transistor Tr 13) between electric potential difference (equaling the absolute grid-source voltage of transistor Tr 13) be greater than transistor Tr 13 threshold voltage vt h absolute value (for example, with the absolute value of the electric potential difference of the electromotive force of power voltage line VL be 5V-5V), as fine line (Vrst=-5V in Fig. 9, Absorption Current [Vth=1V]) and heavy line (Vrst=-5V, Absorption Current [Vth=3V]) shown in, as being made as in the high-grade region of the relatively large neutralization of grading current Ipix at resetting voltage Vrst under the situation of 0V, light emission drive current Ib presents gratifying linearity with respect to the characteristic of grading current (Absorption Current) Ipix.In this case, because capacitor Cs is charged after having applied resetting voltage Vrst, so the sub-fraction in grading current Ipix is for the capacitor Cs in inferior grade region is charged, and the impact that the threshold voltage vt h of transistor Tr 13 changes is suppressed.But, owing to applying the charging voltage of capacitor Cs after resetting voltage higher than the threshold voltage vt h of transistor Tr 13, even if be made as at grading current Ipix under zero situation, light emission drive current Ib also cannot be set as absolute null value, and minimum electric current does not need to flow in organic EL OLED.In this case, provide the black display rank of benchmark of brightness degree by " rising " (changing over a brighter side), and contrast will reduce, thereby cause sharply deteriorated problem of display quality.
Given this, according to the present invention, as described above in Example, the resetting voltage Vrst that its absolute value is greater than to 0V is applied to data line DL, thereby to being retained in the electric charge in the distribution electric capacity of particular data line DL and remaining in display pixel EM(pixel-driving circuit DC) capacitor Cs in electric charge discharge, using as voltage reset operation.After this, to have corresponding to showing the signal polarity (plus or minus) of data and the grading current Ipix of amplitude, offer display pixel EM by every data line DL, using as electric current write operation, for remaining on the capacitor Cs of each display pixel EM corresponding to the component of voltage of specific grading current Ipix.
According in the write operation of the display device of this embodiment, the signal polarity of the grading current Ipix exporting from data driver 130 is switch and set according to the brightness degree value that shows data, thereby make positive grading current (source electric current) Ipix offer data line DL, and the write current Ia corresponding to specific grading current Ipix topples over display pixel EM(pixel-driving circuit DC from data driver 130 via data line DL), using the current source system in inferior grade region.Current absorption system is used in the high-grade region of neutralization, whereby, negative grading current (Absorption Current) Ipix offers data line DL, and corresponding to the write current Ia of specific grading current Ipix from display pixel EM(pixel-driving circuit DC) be drawn into data driver 130 via data line DL.
In the application of this driving control method of use, relation between voltage reset operation middle grade electric current I pix and light emission drive current Ib keeps in the following manner:, the absolute value that resetting voltage Vrst is set as resetting voltage Vrst is greater than a certain value of 0V, or, preferably, be set as between power voltage line VL and the drain electrode and source electrode of contact N12(transistor Tr 13) between the absolute value of electric potential difference be greater than a certain value (for example, absolute value be 5V-5V) of the absolute value of the threshold voltage vt h of transistor Tr 13.
Then, carry out electric current write operation, make in the lower region of the brightness degree based on showing data (grading current Ipix gets the inferior grade region of very little value), (Vrst=-5V as shown in fine line in Figure 10, Absorption Current adds source electric current [Vth=1V]), it is negative for very little positive grading current (source electric current) Ipix(in the performance diagram of Figure 10) offer data line DL from data driver 130, make specific grading current Ipix topple over display pixel EM from data driver 130 via data line DL.Result, corresponding to the component of voltage of grading current Ipix being set as the electric current write operation period Tprg(=55 μ sec of simulation test condition) in can be kept fully (writing), and can carry out light emission operation, make to offer organic EL OLED(especially corresponding to the very little light emission drive current Ib of grading current Ipix from pixel-driving circuit DC, be cut off to the light emission drive current of organic EL OLED from pixel-driving circuit DC).Meanwhile, utilize the grading current Ipix being associated with zero luminance light emission drive current Ib can be made as to zero, thereby realize the gratifying linearity of light emission drive current Ib with respect to grading current Ipix.Therefore, can set rightly black display rank (show state under zero grade) and inferior grade display level, thereby can carry out displays image information with high-contrast.
Under above-mentioned simulation test condition, in grading current Ipix(Figure 10 of 0.5 μ A-0.5A) topple over display pixel EM from data driver 130 via data line DL, make can write display pixel EM corresponding to the component of voltage of zero grade, thereby can set rightly black display rank.
In addition, in the high-grade region of the relatively large neutralization of grading current Ipix, as in above-mentioned comparison other, the positive current in negative grading current (Absorption Current) Ipix(Figure 10) provide and be drawn into data driver 130 from display pixel EM via data line DL.Like this, according to specific grading current (Absorption Current) Ipix, the light emission drive current Ib of substantial linear can be offered to organic EL OLED.
So, the grading current Ipix that offers display pixel EM from data driver 130 be made as have corresponding to show data (brightness degree value) signal polarity (plus or minus) and amplitude (, grading current Ipix extends to minus negative current region in Figure 10) situation under, can be kept fully by display pixel EM corresponding to the component of voltage that shows data, and image information can show with suitable brightness degree.
And, even for example, in the case of the threshold voltage vt h of the transistor Tr 13 of the pixel-driving circuit DC for the each display pixel EM of being arranged on of luminous driving change (threshold voltage vt h becomes 3V from 1V) (Vth drift), as fine line (Vrst=-5V in Figure 10, Absorption Current adds source electric current [Vth=1V]) and heavy line (Vrst=-5V, Absorption Current adds source electric current [Vth=3V]) shown in, the variation of light emission drive current Ib in inferior grade region reduces, and the brightness of organic EL OLED variation is suppressed, thereby can be to carry out light emission operation corresponding to the appropriate brightness degree that shows data.
Next, the operating effect to above-described embodiment is verified in more detail.
Figure 11 is illustrated in the writing than the performance diagram of relation between (reset current ratio) of the grading current that is applied to the magnitude of voltage of data line and display pixel in voltage reset operation and offers display element.
Figure 12 is the performance diagram that the switch that is illustrated in the signal polarity of electric current write operation middle grade electric current is set relation between the degradation that exists or do not have and offer the light emission drive current of the organic EL ratio of the light emission drive current in when decline (when the initialization with).
Figure 13 is illustrated according to the sequential chart of change in voltage when write operation in the display device of embodiment.
Above-mentioned according in the driving control method of this embodiment, show in the current component of write operation in display pixel EM and the checking of the ratio (reset current ratio) of grading current (initial current) Ipix providing from data driver 130 for practical function: as shown in Figure 11, the absolute value higher (in Figure 11, resetting voltage Vrst is lower) of resetting voltage Vrst, the raising of write current ratio is just larger, and gets over close to " 1 " in inferior grade region.
Particularly, as shown in Figure 11, can make write current approach " 1 " (being essentially the All Ranges of grading current) than in all hierarchical regions, and, (absolute value of magnitude of voltage is larger to be set to less magnitude of voltage corresponding to the component of voltage of grading current (initial current) Ipix at resetting voltage Vrst, for example-7V or-10V) be for example set to, under the situation of 0V or (,-3V) near and can keep more satisfactorily than resetting voltage Vrst under situation.
In addition, according to this embodiment, as shown in Figure 12, light emission drive current Ib is shown with respect to the inspection of the degradation of grading current Ipix, the degradation of light emission drive current Ib in inferior grade region is by according to showing that the brightness degree of data switches to set under the situation of current absorption system or current source system each other, than only providing under the situation of grading current Ipix and can be subject to more inhibition by current absorption system." degradation of light emission drive current Ib " is defined as the ratio (Ibe/Ibs) between the light emission drive current Ibs under the original state that after threshold voltage vt h changes the light emission drive current Ibe of decline and the threshold voltage vt h of luminous driving transistors Tr13 in pixel-driving circuit DC do not change (Vth drift),, issue the minimizing degree of optical drive current Ib at deterioration state.By way of parenthesis, according to this embodiment, it is that 1V and deterioration state threshold voltages Vth are [Vth drift after] after 3V(threshold voltage vt h changes that Figure 12 shows at the original state threshold voltages Vth of supposition transistor Tr 13) carry out the result of simulation test.
Particularly, only use current absorption system to carry out under the situation of electric current write operation, as shown in the fine line in Figure 12, degradation owing to the light emission drive current Ib of the variation of threshold voltage vt h is about zero, and corresponding to the light emission drive current Ib(=Ibe that shows data (grading current Ipix)) substantially cannot flow into the organic EL OLED in the very little inferior grade region of grading current Ipix.On the other hand, by between current absorption system and current source system switch set under the situation of signal polarity of grading current Ipix, as shown in the heavy line in Figure 12, the degradation of light emission drive current Ib is generally not less than 0.6, and corresponds essentially to the light emission drive current Ib(=Ibe that shows data (grading current Ipix)) even still can offer organic EL OLED under the very little situation of grading current Ipix.
As mentioned above, carry out in the following manner electric current write operation:, the resetting voltage Vrst execution voltage reset operation that uses absolute value to be greater than zero, afterwards by switching to set the signal polarity of grading current Ipix according to the brightness degree that shows data by current absorption system and current source system.Whereby, write current ratio in write operation can be improved, and light emission drive current Ib is along with the variation of the threshold voltage vt h of luminous driving transistors Tr13 decline (minimizing) is in time subject to more inhibition, its result is in predetermined electric current write operation period Tprg, can be satisfied with corresponding to the predetermined voltage component of grading current Ipix and keep fully (writing), simultaneously can be to carry out the light emission operation of organic EL OLED corresponding to the suitable brightness degree of demonstration data.
Therefore,, according in the write operation of the driving control method of this embodiment, as shown in FIG. 13A, suppose that resetting voltage Vrst is made as zero (being expressed as in the drawings " being reset to 0V ").So, if the threshold voltage vt h of luminous driving transistors Tr13 changes, for example become 3V from 1V, in voltage reset operation, be applied to that transistor Tr 13 drains and source electrode between voltage lower than the fact of threshold voltage vt h make electric current be difficult to transistor Tr 13 drain and source electrode between flow, consequently reset operation cannot effectively be carried out within the voltage reset operation period, and the component of voltage that time that need to be relatively long carries out in follow-up electric current write operation keeps operation.As shown in Figure 13 B, resetting voltage Vrst is set as that under the situation of low-voltage more, (absolute value of voltage is greater than zero, between power voltage line VL and contact N12, the electric potential difference absolute value of [between the drain electrode and source electrode of transistor Tr 13] approaches or is greater than the absolute value of the threshold voltage vt h of transistor Tr 13, for example-5V) (in figure, being expressed as " being reset to larger voltage "), the absolute value of the electric potential difference between the drain electrode and the source electrode that are applied to transistor Tr 13 during voltage reset operation becomes the absolute value that approaches or be greater than threshold voltage vt h.Therefore, electric current is easy to flow between the drain electrode of transistor Tr 13 and source electrode, and can within the voltage reset operation period, carry out fully reset operation.Result, in follow-up electric current write operation, remain on the capacitor Cs in display pixel EM(pixel-driving circuit DC) in component of voltage (maintenance voltage) can be rapidly converge to black display rank Vp or contiguous inferior grade display level Vq(elapsed time Ta1<Tb1, Ta2<Tb2 from low resetting voltage (5V)).Therefore, corresponding to showing that the component of voltage of data can be 55 μ sec in predetermined this embodiment of electric current write operation period Tprg() in keep fast and satisfactorily (writing).
Although the checking of aforementioned operation effect shows the analog result of carrying out under fc-specific test FC condition, the inventor has confirmed also can obtain the result of similar trend under other test conditions.
The 2007-172317 Japanese patent application that the application submitted to based on June 29th, 2007, comprises instructions, claims, accompanying drawing and summary.The full content of above-mentioned Japanese Patent Application Publication is incorporated to the application by reference.

Claims (13)

1. a display drive apparatus, for driving the display pixel that is connected to data line, described display pixel comprises the pixel-driving circuit of light-emitting component and the described light-emitting component of driving,
Described pixel-driving circuit comprises luminous driving element, and described luminous driving element has current path and control terminal, and one end of this current path is connected to one end of described light-emitting component, and the other end of this current path is connected to the power lead that supply voltage is provided,
Described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path
This display drive apparatus comprises:
Reset circuit, it is by being set as described display pixel described selection mode and resetting voltage is applied to described display pixel by described data line, carry out display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described data line and the capacitance component of described display pixel can be discharged; And
Grading current provides circuit, the drift current of its generated data electric current and regulation, and the grading current that deducts described data current from described drift current and generate is offered by described data line and is set as described selection mode and carried out described initialized described display pixel, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein said grading current provides circuit to comprise:
Data current source, it generates described data current; With
Drift current source, it generates described drift current,
In the time that being greater than the current value of described drift current, the current value of described data current is set to first mode, in this first mode, use described data current source, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set to the second pattern, in this second pattern, use described drift current source, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
2. display drive apparatus according to claim 1, wherein said grading current provides circuit to have to be connected to the lead-out terminal of described data line, and the output terminal of the described drift current of inflow in the input end that draws described data current in described data current source and described drift current source is connected to described lead-out terminal.
3. display drive apparatus according to claim 1, the other end of the described light-emitting component in wherein said display pixel is connected to the reference voltage with predetermined potential, and
Described resetting voltage is set to an electromotive force, makes not have light-emitting component described in current direction under this electromotive force.
4. display drive apparatus according to claim 1, the absolute value of wherein said resetting voltage be greater than with the driving period of being scheduled to, described grading current is applied to described light-emitting component by described luminous driving element and drive after, the absolute value of value from the initial value of the described threshold voltage of described luminous driving element changes.
5. display drive apparatus according to claim 1, also comprises selection circuit, and described display pixel is set as described selection mode by this selection circuit.
6. a display device, its displays image information, comprising:
Display panel, there is the array of multiple display pixels, described display pixel is arranged near of the each point of crossing in the multiple point of crossing between multi-strip scanning line and many data lines, wherein each display pixel comprises light-emitting component and pixel-driving circuit, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path,
Reset circuit, it is applied to described each display pixel by resetting voltage by described every data line by described display pixel is set as to described selection mode and carrys out each display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and there is the polarity that the electric charge being retained in the distribution electric capacity of described every data line and the capacitance component of described each display pixel can be discharged, and
Grading current provides circuit, the drift current of its generated data electric current and regulation, and the grading current that deducts described data current from described drift current and generate is offered by described data line and is set as described selection mode and carried out described initialized described display pixel, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein said grading current provides circuit to comprise:
Data current source, it generates described data current; With
Drift current source, it generates described drift current,
In the time that being greater than the current value of described drift current, the current value of described data current is set to first mode, in this first mode, use described data current source, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set to the second pattern, in this second pattern, use described drift current source, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
7. display device according to claim 6, wherein said grading current provides circuit to have to be connected to the lead-out terminal of described data line, and the output terminal of the described drift current of inflow in the input end that draws described data current in described data current source and described drift current source is connected to described lead-out terminal.
8. display device according to claim 6, the other end of the described light-emitting component in wherein said display pixel is connected to the reference voltage with predetermined potential, and
Described resetting voltage is set to an electromotive force, makes not have light-emitting component described in current direction under this electromotive force.
9. display device according to claim 6, the absolute value of wherein said resetting voltage be greater than by the described luminous driving element of described each display pixel with the driving period of being scheduled to, described grading current is applied to described light-emitting component and drive after, the absolute value of value from the initial value of the described threshold voltage of described luminous driving element changes.
10. display device according to claim 6, also comprise scan drive circuit, it,, by sweep signal being sequentially applied to each in described multi-strip scanning line, is sequentially set to described selection mode by the described each display pixel that is connected to described every sweep trace.
11. display device according to claim 6, wherein said each display pixel has maintenance electric capacity, for keeping electric charge based on described grading current using as component of voltage, and
The described component of voltage of described luminous driving element based on remaining in described maintenance electric capacity, offers described light-emitting component by light emission drive current, to carry out the light emission operation of described light-emitting component.
The driving control method of 12. 1 kinds of display drive apparatus, described display drive apparatus is for driving the display pixel that is connected to data line, described display pixel comprises light-emitting component and drives the pixel-driving circuit of described light-emitting component, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path, said method comprising the steps of:
Described display pixel is set as to selection mode;
Resetting voltage is applied to the described display pixel that is set to described selection mode by described data line, thereby display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described data line and the capacitance component of described display pixel can be discharged; And
After having carried out described initialization, the drift current of generated data electric current and regulation, and deduct described data current and generate grading current from described drift current, by described data line, described grading current is offered to the described display pixel that is set as described selection mode, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein, described grading current is offered in the step of described display pixel,
In the time that being greater than the current value of described drift current, the current value of described data current is set as first mode, in this first mode, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described display pixel by described data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set as the second pattern, in this second pattern, make to deduct described data current and the described grading current that generates flows to the direction that flows into described display pixel by described data line from described drift current.
The driving control method of 13. 1 kinds of display device, described display device is for displays image information on display panel, described display panel has the array of multiple display pixels, described multiple display pixel is arranged near of the each point of crossing in the multiple point of crossing between multi-strip scanning line and many data lines, wherein each display pixel comprises light-emitting component and pixel-driving circuit, described pixel-driving circuit comprises luminous driving element, described luminous driving element has current path and control terminal, one end of this current path is connected to one end of described light-emitting component, the other end of this current path is connected to the power lead that supply voltage is provided, described luminous driving element, in the time that described display pixel is set as to selection mode, connect described data line in one end of described current path, on described control terminal, connect the other end of described current path, in the time that described display pixel is set as to nonselection mode, cut off one end and the described data line of described current path, and cut off the other end of described control terminal and described current path, said method comprising the steps of:
Described each display pixel is set as to selection mode;
By being applied to the described each display pixel that is set to described selection mode by described every data line, resetting voltage carrys out each display pixel described in initialization, the magnitude of voltage that wherein said resetting voltage has makes the absolute value of the electric potential difference between one end and the other end of the described current path that is applied to described luminous driving element be greater than the absolute value of the threshold voltage of described luminous driving element, and has the polarity that the electric charge being retained in the distribution electric capacity of described every data line and the capacitance component of described each display pixel can be discharged; And
After having carried out described initialization, the drift current of generated data electric current and regulation, and deduct described data current and generate grading current from described drift current, by described data line, described grading current is offered to the described display pixel that is set as described selection mode, described data current has the current value corresponding with the brightness degree value that shows data, be set as flowing to the direction of drawing via described data line from described display pixel, the drift current of described regulation is set as flowing to the direction that flows to described display pixel via described data line
Wherein described grading current is offered in the step of described each display pixel,
In the time that being greater than the current value of described drift current, the current value of described data current is set as first mode, in this first mode, make to deduct described data current and the described grading current that generates flows to the direction of drawing from described each display pixel by described every data line from described drift current
In the time that being greater than the current value of described data current, the current value of described drift current is set as the second pattern, in this second pattern, make to deduct described data current and the described grading current that generates flows to the direction that enters described each display pixel by described every data linear flow from described drift current.
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JP2009009039A (en) 2009-01-15
HK1136686A1 (en) 2010-07-02
CN101548311A (en) 2009-09-30
KR101178981B1 (en) 2012-08-31
US20090002405A1 (en) 2009-01-01
TW200915269A (en) 2009-04-01
JP5467484B2 (en) 2014-04-09
TWI411997B (en) 2013-10-11
KR20090086197A (en) 2009-08-11

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